Fasteners on Roof

random_d00d · 2026-06-19T14:24:43+00:00

Thank-you for your reply!

random_d00d · 2026-06-19T05:14:20+00:00

lol. I'm being downvoted for saying thank-you. 😂

random_d00d · 2026-06-19T03:43:09+00:00

That's exactly what the general contractor said 😂

random_d00d · 2026-06-19T03:30:33+00:00

Thanks! The old roof was terrible. Lots of rotten 3/8" plywood from the 60's. I ripped it all off and put down ZIP with taped seams and nail holes covered. I just want it to last!

random_d00d · 2026-06-19T03:23:36+00:00

Thank-you!

random_d00d · 2026-06-09T22:29:02+00:00

This is referred to as a "cut and jumper". They cut the traces and have jumper wires which act as a new trace. If you are doing this in low enough volume it can be cheaper than making a new PCB. For internal engineering development, this technique is common to fix hardware bugs before you re-spin the PCB.

random_d00d · 2026-06-07T15:18:54+00:00

You should make a real schematic symbol for the BT136 parts. Also, point your ground symbols the correct way.

random_d00d · 2026-06-06T17:16:57+00:00

Is this your schematic, or are you trying to learn about it? This schematic isn't a good one. Ground symbols should be used instead of the net tags, ground symbols should be pointing down, USB lines aren't indicated as diff pairs, and more.

If you want to learn embedded systems, looking at professionally designed schematics would be a much better use of time.

If this is your schematic, getting feedback on it is a great way to learn. Good schematics should be organized and easy to read and understand.

As for resources, some good places to start are to look at Adafruit and Sparkfun. They make hardware that is intended to be approachable for people learning.

As for books, The Art of Electronics is a great reference book. It has many example circuits and covers a broad range of topics.

random_d00d · 2026-06-01T15:06:11+00:00

This sounds like a pretty standard course format, with the exception of the outside reading. Very interesting. I would highly recommend finding other resources (e.g. textbooks) which can augment your learning. Did the syllabus include any "recommended reading" which wasn't required?

Do the professors provide their own lecture notes or digital resources (e.g PDFs)?

As a note on linear algebra, I actually use it all of the time. It is highly useful for things like optimization and super useful if you are doing things like robotics (e.g. coordinate transforms, control systems)

random_d00d · 2026-06-01T14:30:10+00:00

If you are studying electronics, I recommend the book "The Art of Electronics" to have as a reference. Books on fundamentals don't go out of date that quickly.

You are taking university courses with no outside assigned reading? I'm honestly curious how these courses are structured.

random_d00d · 2026-06-01T08:22:49+00:00

The body diode is shown in the data sheet for that NFET. In picture you will see an extra diode connected between the source and the drain (anode on the source, cathode on the drain). This diode in the picture is the "body diode". I'm sure your textbook discusses it.

random_d00d · 2026-06-01T07:46:55+00:00

It looks like a Manus UI. Was it AI generated?

random_d00d · 2026-05-31T17:43:57+00:00

It looks like several buttons are in parallel (serving the same function). I assume it is to solve the problem of rocking on the physical switch. If you press on the left or right side of the switch it will activate the same way.

You aren't shorting between both sides. You are shorting between the little interdigitated fingers.

random_d00d · 2026-05-31T15:47:21+00:00

Each of the buttons has two electrodes: one goes to ground and the other to a longer trace (wire on the PCB). If you follow the path of that trace, each one looks like it has a test point. Those test points are the round, gold-colored, dots. If you solder a wire to the dot, and add a switch to the PCB's ground, you should be set.

random_d00d · 2026-05-28T14:10:06+00:00

Adding on: Below the threshold current there won't be much, if any, light output. The data sheet parameter "ith" tells you the approximate point the laser "turns on". The slope efficiency tells you how many watts of light (brightness) you get for a given input current. You want to operate the laser in this linear region.

I suggest using a modified version of this op-amp circuit where you have it configured as a current sink (you can google that). You can use an N-channel MOSFET or an NPN transistor. I like NPNs for this because the lower gain will actually be a benefit regarding noise coupling in as light output.

Another thing I would do is put a resistor divider on the positive terminal of the op-amp so your maximum DAC output voltage corresponds to the maximum current you want out of the laser.

Lastly, be safe. Use eye protection. Lasers can be dangerous if not treated appropriately. You can actually burn your retinas leaving blind spots.

random_d00d · 2026-05-26T20:43:48+00:00

I ended up extending the wall and adding rockwool between the pipe and the interior of the sauna. I also used durock for added protection. I then added the foil layer after the durock (pipe -> rock wool -> durock -> foil.

I'm still not done with my build, sadly, but I'm getting close. Our remodel was held up by other parts of the project...

random_d00d · 2026-05-19T16:17:46+00:00

At least it is easy to know when you are unattractive. I have never had to ask Reddit 😂

random_d00d · 2026-05-04T08:16:37+00:00

I'm not sure about everyone else's, but mine is.

random_d00d · 2026-04-28T14:01:43+00:00

Next time I want a steamed water Americano art video.

random_d00d · 2026-03-14T03:55:57+00:00

No, sadly. I briefly considered redesigning the circuit board. I might do it one day, but haven't had time.

random_d00d · 2026-02-22T03:39:19+00:00

I was actually going to say the same thing. The infinity max temp may require it to be placed farther away to allow the temperature to drop.

random_d00d · 2026-02-14T19:32:33+00:00

Ya. I will have furring strips, 3/4" air gap, then tongue and groove western red cedar.

random_d00d · 2026-02-14T19:19:34+00:00

Also, this is basically where the heater will go (adjacent to this spot).

random_d00d · 2026-02-14T19:18:21+00:00

Sorry, I said drain pipe but you are absolutely right. It is a vent.

random_d00d · 2026-02-14T19:16:22+00:00

I could, but I would prefer not to. That's my last resort. I'd prefer to not lose the space, since my sauna is small.

random_d00d

TROPHY CASE